Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSJEEP2008LIBERTY SPORT, RWD, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISDTCS P0420 TO P0563
2008 Jeep Liberty Sport, RWD, Automatic
DTCS P0420 To P0563
2008 Jeep Liberty Sport, RWD, AutomaticSECTION DTCS P0420 To P0563
- P0420-Catalyst Efficiency (Bank 1)
- P0430-Catalyst Efficiency (Bank 2)
- P0440-General EVAP System Failure
- P0441-EVAP Purge System Performance
- P0443-EVAP Purge Solenoid Circuit
- P0452-EVAP Pressure Switch Stuck Closed
- P0455-EVAP Purge System Large Leak
- P0456-EVAP Purge System Small Leak
- P0457-Loose Fuel Cap
- P0461-Fuel Level Sensor 1 Performance
- P0462-Fuel Level Sensor 1 Circuit Low
- P0463-Fuel Level Sensor 1 Circuit High
- P0480-Cooling Fan 1 Control Circuit
- P0481-Cooling Fan 2 Control Circuit
- P0501-Vehicle Speed Sensor 1 Performance
- P0503-Vehicle Speed Sensor 1 Erratic
- P0506-Idle Speed Performance Lower Than Expected
- P0507-Idle Speed Performance Higher Than Expected
- P050B-Cold Start Ignition Timing Performance
- P050D-Cold Start Rough Idle
- P0513-Invalid Skim Key
- P0522-Engine Oil Pressure Too Low
- P0532-A/C Pressure Sensor Circuit Low
- P0533-A/C Pressure Sensor Circuit High
- P0562-Battery Voltage Low
- P0563-Battery Voltage High
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.